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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0888f55fc87d33512485fd742a707c9ad743dd2f93d4d0fdf41e17941f99e60' 
  AND token = 'fKdD079az1Xp5PCD5JjhmEum6Szj+Qt2yRvhWKx49no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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