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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e67efdbae953f77c5fb9aec4df4547b4ac9e203011868c8d4b5df891014d9f' 
  AND token = 'WduBN1LytT6CKepBYET0LMuFkMdsHt4K5fFnhiyPq7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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