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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac500b86d193958edd1750a81941cf0085e00bdc3b1c6901d0c91d5addb39d8' 
  AND token = 'xjFGf1D7p8AMhytc9GHwhzpm61kRPLTexBuk9BzvUQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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