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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cdc9fdeaa4ab8d749dd4329ec1ea9f0134f927a9d3567d9e1941018537facfb' 
  AND token = 'vzOc39ahYVCCE9PSzOjUoX7C82VCDTBBCQ6joTRRvYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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