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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3109c0d39c28b13a97194dc2a92206eb3f490890cc98159f4f735ecc41ded6e' 
  AND token = 'wTUoexRwFOg09oYifeyTm0dQ2InV2b8dRTwBuga5rBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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