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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532a0555433ef886e2b84ed77c94d6d1b9e5570ca35d727c4b62a9a971bf0d5b' 
  AND token = 'F7gJvHUS1yNIFA6LyaScO9hqhhf06IbeDV5+lFyrbkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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