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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61b9c591fab01cc53b1fc19efd92936b25ae0f2df8770069eca5e2a25b694cd' 
  AND token = 'fA6QJMsIr0e0x/82Yq54FJ+w2gYon94vwFFm3p1UFq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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