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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80aca9b152c9340d499df4483f592ac180476a4ec9193533ea607667c8457aa' 
  AND token = 'VpBB/8hYo9avA8WA7sby6vXaKzB2Kpw/eOItEfi7icw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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