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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf40d3ccb8a24269b4b47c2ddef51ec2954e8e422b7dfc56d8f47d592c9653a' 
  AND token = 'S8L+PN1HfoApubBBHpJI0NjJQOxHwf7BT29DEJwq9G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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