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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5d7709a73dacc0675d1984d739ecc44b04eb184028d23057f6a9bfa4f47eb0' 
  AND token = 'UkirB25lEyA58OX2ynm+AIsqYPz/W6x7ybldYrx372E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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