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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72fa482593c8274c1f1f9ad01c843b017eaad5c49d7ee7b46eea78b73318f7e' 
  AND token = 'KX3yOFBcHM78rp3Huuh5l44A9hHwsdOyUiLOck9qPEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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