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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d20bf2e29c3e52042f7d8c941092d11e0e0bd66225a29f49e41a135734ed9bb' 
  AND token = '7A+0jsq4O5FGoOwZjreisnlfZeU6/YFMSVvunZc9m/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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