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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5ea575eecf29b0586eed47c0ae960cc03193e5b84eb7bcc6b34f5b7942f3f6' 
  AND token = 'vAMzO3ZYn5VI7dSvPmwraHTa0TBI1QiF52uW6V/ZiHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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