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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbedac541cc4d1d4ab8d7489fca3ecb5862531efa2e1db9cdd616d017f7da0d' 
  AND token = 'gX4C8wj/Uj5SlgC11DwJ0RH/7WTHbd00j8WvQ0Vshy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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