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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb0eda262c55d2e2780003137a77e664feacd31ecadf7e2127e6c4b602585d7' 
  AND token = 'w9T7kBdfjx/VWeGg84Wa8j6+gBms8fuZc0xTWyErM0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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