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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1761abb617a039ec85ac00e60d11e542cfe81830cd997476148eba72ebe0a02' 
  AND token = '9Lziu0E7dtDk+aIpRvqbH7VdKscrEskArPLnWdKVVPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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