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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d30b20389360ad255573e1460aa1a318ea3a768496fe827b66c0bacf25285c' 
  AND token = 'AdD+SYmiQrneHr1vqIDzK6UrXKVUdmjtiEdorSUU4j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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