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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f82e0b8d4fba11d735d4e2015fe6bd2bfde598a2b32c04c59568c698599c92' 
  AND token = 'WABDo0ldEcUZp4mzno7iJSAdyzkxyw/3QsW28j4qGD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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