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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1fde10063499bbbff5ad8bdfc70c0dae92a59f8f50a3cf9941775ba643d7d76' 
  AND token = 'gYcMeaACtysZhR8dvTw3wUx4mg2d5cAPZdnzfEq6gPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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