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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe19170fe4f0d99f06118b8f2e0a5f01cd0bd136f1e1e6a8c699d91b546d90f4' 
  AND token = 'S7uROHWOGjijc6mbB9d12xp8SPAQC4FShCTfhPgFoBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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