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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951ff8f9131eda1bbeb33d55837a73ae03d3aa455df28066954c9b3c48622c4f' 
  AND token = 'opvjrMVZJ0e5rmN5r3/f9PeLRI9E1O3AoKgvdrCzEJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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