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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be1a30a6f729735f7bafd458a1518a068dd617f729189a548c3ab12ace0af0b' 
  AND token = 'Mn0pvxQdTnotq07sW2E1i/3fQf0eIGkAlvJbjNC0lSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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