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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ac60d2f60ba86dbf3a95407ef52764a78903c564a61365e1a8acd7d3e9c23a' 
  AND token = 'Guard1AHlwrCpwQMTpKY2X/uAlPfahGxN1seyGKdoos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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