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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302ec0822fe511e79733d3548937fbbc8dcfbce1ff400d6b5d25b7700dfeb208' 
  AND token = '+O0wtV7KE8KOdThnLw0wBLhSlEuJlU3M+MqxiZ8J3So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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