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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f534532cf0d1e7d2ef7667a4273cb1b9b71a7b788f4e0be61811cd4b34e901f6' 
  AND token = '/OFl03p7CRr+fNB3/TfuZxLBWNseTL3mmPA2Ytyw/kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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