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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10d9de95dc23e2b71d7efd19bc8dbc5728f65ff25f6b856b02e2bf02bec8729' 
  AND token = '5WagLcgboo4KMEIxTh8gOc0qXIUAFDuEpGzWt2TiAqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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