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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56abba0c771ba59f5b5c4d78c51ed70b86cf3f67dfdc5b6f9bfe3139814bb869' 
  AND token = 'j7FQqtqEZ7OB2U+1YfZ7llrKWX826cs5zlTxwuazdNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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