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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe2f99b04d8634ccc5e7db12a2b1f0d5d99683ab8883ad9c0373ade5cf517b7' 
  AND token = '7wyyZsbBiOTr3wjOlxCFnWuD5DeQ5C50f9MgQnU73+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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