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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f70584100a2c089b96e244f7d942156421d29a8d1d252c70434f9ff66ace4a6' 
  AND token = 'cCfZhbX1zV4T+OodNEOnX2uYWdbu31uS0XJU0C4bmPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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