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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9fe3254440ac6211a37891ad51b5b9060fa8a3d6ba66b650a5bde98aff38ab' 
  AND token = 'id2TPOP/hcZZ1rSCPXCrcoFFtMGvDrm4g7zq02/u5+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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