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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ba59467b33ee8107131bd7f11e6b5c9ff659e58446fc851cf7cd7871473dcd' 
  AND token = '5GYgmurR/iEY/x0Ue5UB6zhor709J7Ju/IWJRrgHQZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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