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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ee8e1357ded23f6a6ff368e35291fb4f8a77dd8768c5904565438d156c411b' 
  AND token = 'fjzX1HV5P00rjiszquNw0dnzj3WrktphaADtqKCsVaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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