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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede92d3f2aa40ef93beaaae60caf4df6796a491cf2758e6b9d3f25d4f5940858' 
  AND token = '92hWzf8ScGMbl00FxS/mwc2CE5IYpIpvp7vFebaOYKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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