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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b7d9e7444460ba86086b008f3d96cfbfe38f58ae67bd2faf4004ca2228d92d' 
  AND token = 'djopJE4pIqy/4GyIsjaz1djCYDGpFRFkV6DexNg1a7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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