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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a1c31e40042808a1ec3000f1be4f25b50406dcec59317915b881419e5b5939' 
  AND token = 'NPoFOO8Z9NRMtExylv9VYJ62VzAbQl2nZIpQlrYRAq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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