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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a65214aba97a2e9dad256381b86bd6481d6ed960753b2ca4c9708fd01282420' 
  AND token = 'EzmP1ZJALuDiNXv3A+c2HhXUrabDpHHfabd1ew5Tors=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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