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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1d1c2183dcf42d16353e56132ad50bfb00012a3a2d0ce572dbf77a115c2ad1' 
  AND token = 'JMXCMAhsT03R/G54DhesALfgIc2Ev8SawFCymcY91ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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