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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed20d6818ef8da6febbdde13e9ea43e01e26e2cbc924df7ed3af1c0c7679236f' 
  AND token = 'f8MWrusGuf34xPnNV7q3f9/aWVU2U4eENfX/xT8G6zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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