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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26fd9691c3d818e3735c485b34124ce30a87207c97c78133d707db555037d26' 
  AND token = 'TPR+hac3fQIymm6dz2qygyC9DSFIk/Iv0hu/iFZiclg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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