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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767801e84e4dbf4f0ac8045870e205ae08c52ab39ff0fa6b2ccdb0a6d0633c8f' 
  AND token = 'zaDp8hN4SqEQYeCrPfvK4P7hTSTCw7U41OgiuUd6uxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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