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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482d179e2438d73cf4ac70f62acf158751cc54ef82ff286e7046c32e2af128ba' 
  AND token = '2ChT6Gl5gy8e/MuPBh1+mo9nzovp1Zm8mfokDLBcaV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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