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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4a5bb953ea8033fd175e02bf5ae393a3cfa9df62cf65c7e5eed94a97f02611' 
  AND token = 'sdKu0mHME4KUq2KiKBl7T12eBce0lRfZ1exwEmR3r4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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