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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e60e8ce46e6c0ed4184910b7e3eafd7d86ac90967a1da7909446b49d5975a0d' 
  AND token = '3ryt6us2M7a+p5bdYb43MCDWKA4+YA2fopERq2wV8X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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