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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3186522562db4da24c8288ff61b16e6c934131202f3b1e6487b3546280be4c49' 
  AND token = 'Xg4xZo3oHAgdw3pXw2jieJoBvtWq8mjTvFV1y/ormjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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