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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d3c68327b6fa65518972d9b0bc109d4aabbf9456c61513146269eff754981c' 
  AND token = 'zhmOba9D7H16mf/6KACOwUXYq5Z2SMmMtspb3LNNJ3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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