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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee3fafcaf49638390a38998125c95d83f2af837d38caaab1e163eb922778f6b' 
  AND token = '/lFxXi5zay97l9GK1MzPyKUWFiSfycyRDDJUeJT1Zw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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