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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351ac9183979378bf52ab2d949197c5b869fb8dcf7cfe714989959bfbf4975ed' 
  AND token = 'd6LT42Aotj23xcZ1mEmRPeU5R3odRS7DVe0swMqGjCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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