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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8f85b028bc1e66d5eff575ca1e9405422ee770b0d1e2588390d833c6c31caf' 
  AND token = '8mq5vyOQ/TqXxFINGGgngK1TDYrs9/oaW13XgUfCicg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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