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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70e48feae78b7e087482ac80f8fdc8d20d4b041b989b741e26762f12a1abed9' 
  AND token = 'g/k6FE+KVLzlE4gbYu+SR36u8BKQuGxNSzwFcilNqDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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