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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9721abe448e7840400487c3d3a371a16f464ce4dd9515f26aa4fd172308192' 
  AND token = 'suwnOh7cvDVrUoabGQp5rPrj+4l1rV6QbIBooC5XuZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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