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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69550a8b0868175b5df75f6338cdc30da4454869df5c71088f26bfb944382515' 
  AND token = 'L9cVLe6ux1VEd6+9Aq4/4rgn5emwE4YO//gxPS2LtAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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