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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96a76e52fdb192887ebad180ca1951af1a68e03097c7d8419764c199786d20e' 
  AND token = 'HL8IbQWAAimnkhsXKrjyuW7HCL/FlEDZXO0q7Q2eR4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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