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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7d886e24790e32a671fd415e84559d272ee361d2429fc7de5d06195e99669d' 
  AND token = '7fCV5hwU0NEvdr4FT09K/6+WPIa3zqBBMCt/E9XLUj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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