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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583c9b16115ba9586b3b9283d9c96f7c900d2d02e5c95f366fd52d4ba08fa3e8' 
  AND token = 's0d2CJeMbWr//dAEXjFT4i/1LIRzSI/cSGdc55dXy6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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