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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9c31609ed08f25d2a29d7f71eed3ed13d0af1d874e97178020a3cdae4a320f' 
  AND token = '7yJXhQAULgKKQc7zNCIUs9Sty/zqdC565osa3d0g/JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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