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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c46b37b1bca25f5f4260b50a725c39a630de1a2edd8198b2dcfedcb5584932' 
  AND token = 'eqZcradVAskRJ96CzdjoV85+QFJOOX+XMF1Mp/nfGac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}