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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19690ec2fe291f815c01ee1d5aebff7b7ecc8646eb2894bd260e285f09af8445' 
  AND token = 'KZT+dbC0oe2mltHmaxGlEziA0dO+iHp217gSOWc96v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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