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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '709e99788f3aeca6bfe7fd72c3124ac87cf661db58ccb4e12658394fee73f14a' 
  AND token = 'gXbEaYQUMZuPrl9dGdyQVSDd6299GXn17wCAutoTgUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00120

JSON explain

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