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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1cd4051a14d7ca48fc929706d87b1b7d5bc6eeff71e42ad1881e3a446fc856' 
  AND token = 'AmrHYcCTKixsBrWkkawrY61/WNutS8YkphKChcBQ2yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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