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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9557ebe50091cce37ee5041ba6d605c11ba5d0a067334c31db6fac135ae3a477' 
  AND token = 'rPEzSerRmjTziYPzu2enMUbJbx+INqzS4ysmbrNhenc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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