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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09e99d133f895c5295ec76d8a1468110fbecb28e93173350c290f5099f2d4ce' 
  AND token = 'MTWZS/XaJ4XtgQud5co2EoB9mjTrjQ+V7r6xmP1qV0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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