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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ddcc750d5bab900d3d94900b84f9675e6eac3ed9f8aae810f01ac1c84b0cce' 
  AND token = 'mar1us0DIzZocpSNbzwCsWN9N70mcA4M/tsJs2sFqME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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